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Electromagnetic Waves question bank (Physics)

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Q1.

A plane electromagnetic wave propagating in $x$ -direction is described by
$E_{y} = (200 V m^{- 1}) \sin [1.5 \times 10^{7} t - 0.05 x];$ The intensity of the wave is :
(Use $ϵ_{0} = 8.85 \times 10^{- 12} C^{2} N^{- 1} m^{- 2}$ )

(A)

35.4 W m^{- 2}

(B)

53.1 W m^{- 2}

(C)

26.6 W m^{- 2}

(D)

106.2 W m^{- 2}

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Q2.

Which of the following Maxwell’s equation is valid for time varying conditions but not valid for static conditions:

(A)

\oint \vec{B} \cdot \vec{d l} = μ_{0} I

(B)

\oint \vec{E} \cdot \vec{d l} = 0

(C)

\oint \vec{D} \cdot \vec{d A} = Q

(D)

\oint \vec{E} \cdot d \vec{l} = - \frac{\partial ϕ_{B}}{\partial t}

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